examples: add a retransmisison example implementing RFC4588

Currently only SSRC-multiplexed rtx streams are supported

examples/.gitignore

@@ -6,5 +6,6 @@ test-ogg
 test-readme
 test-sdp
 test-video
+test-video-rtx
 test-uri
 test-auth

examples/Makefile.am

@@ -1,6 +1,7 @@
 noinst_PROGRAMS = test-video test-ogg test-mp4 test-readme \
 		  test-launch test-sdp test-uri test-auth \
-		  test-multicast test-multicast2 test-appsrc
+		  test-multicast test-multicast2 test-appsrc \
+		  test-video-rtx
 
 #INCLUDES = -I$(top_srcdir) -I$(srcdir)
 

examples/test-video-rtx.c

@@ -0,0 +1,98 @@
+/* GStreamer
+ * Copyright (C) 2008 Wim Taymans <wim.taymans at gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <gst/gst.h>
+
+#include <gst/rtsp-server/rtsp-server.h>
+
+/* this timeout is periodically run to clean up the expired sessions from the
+ * pool. This needs to be run explicitly currently but might be done
+ * automatically as part of the mainloop. */
+static gboolean
+timeout (GstRTSPServer * server, gboolean ignored)
+{
+  GstRTSPSessionPool *pool;
+
+  pool = gst_rtsp_server_get_session_pool (server);
+  gst_rtsp_session_pool_cleanup (pool);
+  g_object_unref (pool);
+
+  return TRUE;
+}
+
+int
+main (int argc, char *argv[])
+{
+  GMainLoop *loop;
+  GstRTSPServer *server;
+  GstRTSPMountPoints *mounts;
+  GstRTSPMediaFactory *factory;
+
+  gst_init (&argc, &argv);
+
+  loop = g_main_loop_new (NULL, FALSE);
+
+  /* create a server instance */
+  server = gst_rtsp_server_new ();
+
+  /* get the mount points for this server, every server has a default object
+   * that be used to map uri mount points to media factories */
+  mounts = gst_rtsp_server_get_mount_points (server);
+
+  /* make a media factory for a test stream. The default media factory can use
+   * gst-launch syntax to create pipelines.
+   * any launch line works as long as it contains elements named pay%d. Each
+   * element with pay%d names will be a stream */
+  factory = gst_rtsp_media_factory_new ();
+  gst_rtsp_media_factory_set_launch (factory, "( "
+      "videotestsrc ! video/x-raw,width=352,height=288,framerate=15/1 ! "
+      "x264enc ! rtph264pay name=pay0 pt=96 "
+      "audiotestsrc ! audio/x-raw,rate=8000 ! "
+      "alawenc ! rtppcmapay name=pay1 pt=97 " ")");
+
+  /* store up to 0.4 seconds of retransmission data */
+  gst_rtsp_media_factory_set_retransmission_time (factory, 400 * GST_MSECOND);
+
+  /* attach the test factory to the /test url */
+  gst_rtsp_mount_points_add_factory (mounts, "/test", factory);
+
+  /* don't need the ref to the mapper anymore */
+  g_object_unref (mounts);
+
+  /* attach the server to the default maincontext */
+  if (gst_rtsp_server_attach (server, NULL) == 0)
+    goto failed;
+
+  /* add a timeout for the session cleanup */
+  g_timeout_add_seconds (2, (GSourceFunc) timeout, server);
+
+  /* start serving, this never stops */
+  g_print ("stream ready at rtsp://127.0.0.1:8554/test\n");
+
+  g_main_loop_run (loop);
+
+  return 0;
+
+  /* ERRORS */
+failed:
+  {
+    g_print ("failed to attach the server\n");
+    return -1;
+  }
+}